Need help with Blender Boolean tool.

I'm new to Blender, I've been using it for a few weeks, this being my third thing being built on Blender, and I was experimenting with the Boolean tool previously, and now it's not doing what it was earlier? When trying to cut out the trigger area, and the trigger guard is molding itself to the piece im using to cut the area out? Screenshots attached.

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Looks like the settings are okay. Maybe you have the boolean modifier on the wrong object? You want to put the modifier on the object that is getting cut and not the one doing the cutting. I'm not certain if that is the case just from the screenshot.

Rather, if you'd add me on Skype IrascibleOne, I could show you realtime the problem, and after experimenting for a couple of hours, I found that it tends to happen when you try and use Boolean multiple times on the same object. Maybe a glitch? I have no idea.

selects the shape to which you're going to get the piece, then add modifier> modifier boolean which says intersection, you place difference, then the object that was left as remains, you hide it in another layer. Write me a message on my blog http://androb0t.blogspot.com and upload a tutorial.